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PRODID:-//LBNL Physics Division Research Progress Meetings - ECPv6.8.3//NONSGML v1.0//EN
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X-ORIGINAL-URL:https://rpm.physics.lbl.gov
X-WR-CALDESC:Events for LBNL Physics Division Research Progress Meetings
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X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:America/Los_Angeles
BEGIN:DAYLIGHT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
TZNAME:PDT
DTSTART:20160313T100000
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DTSTART:20161106T090000
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20161101T040000
DTEND;TZID=America/Los_Angeles:20161101T170000
DTSTAMP:20260423T185325
CREATED:20160919T152721Z
LAST-MODIFIED:20160919T152721Z
UID:293-1477972800-1478019600@rpm.physics.lbl.gov
SUMMARY:Reserved
DESCRIPTION:
URL:https://rpm.physics.lbl.gov/event/reserved/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20161103T160000
DTEND;TZID=America/Los_Angeles:20161103T170000
DTSTAMP:20260423T185325
CREATED:20160919T152800Z
LAST-MODIFIED:20160919T152800Z
UID:295-1478188800-1478192400@rpm.physics.lbl.gov
SUMMARY:Reserved
DESCRIPTION:
URL:https://rpm.physics.lbl.gov/event/reserved-4/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20161108T160000
DTEND;TZID=America/Los_Angeles:20161108T170000
DTSTAMP:20260423T185325
CREATED:20160919T152821Z
LAST-MODIFIED:20160919T152821Z
UID:297-1478620800-1478624400@rpm.physics.lbl.gov
SUMMARY:Reserved
DESCRIPTION:
URL:https://rpm.physics.lbl.gov/event/reserved-8/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20161110T160000
DTEND;TZID=America/Los_Angeles:20161110T170000
DTSTAMP:20260423T185325
CREATED:20160919T152845Z
LAST-MODIFIED:20160919T152845Z
UID:299-1478793600-1478797200@rpm.physics.lbl.gov
SUMMARY:Reserved
DESCRIPTION:
URL:https://rpm.physics.lbl.gov/event/reserved-13/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20161115T140000
DTEND;TZID=America/Los_Angeles:20161115T150000
DTSTAMP:20260423T185325
CREATED:20161114T084809Z
LAST-MODIFIED:20161114T084809Z
UID:385-1479218400-1479222000@rpm.physics.lbl.gov
SUMMARY:Erez Etzion (Tel-Aviv U.) "Higgs hunting episode II - Searches for Beyond the SM Higgs at the LHC"
DESCRIPTION:ABSTRACT\nThe discovery of the “Higgs like” particle in summer 2012 completed about fifty years of search. In short time with significantly more data we renamed it to be the Higgs particle and continued with studying its characteristic. In parallel to the precision measurements it increased the effort to look for additional Higgs like particles and Higgs related extensions to the  Standard Model. I will review some of these searches with the ATLAS and CMS experiments focusing on the recent data collected by ATLAS in LHC pp collisions at centre of mass of 13 TeV.
URL:https://rpm.physics.lbl.gov/event/erez-etzion-tel-aviv-u-higgs-hunting-episode-ii-searches-for-beyond-the-sm-higgs-at-the-lhc/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20161115T160000
DTEND;TZID=America/Los_Angeles:20161115T170000
DTSTAMP:20260423T185325
CREATED:20160919T153125Z
LAST-MODIFIED:20160919T153125Z
UID:301-1479225600-1479229200@rpm.physics.lbl.gov
SUMMARY:Emmanuel Schaan (Princeton) "Non-linearities in the large-scale structure: noise and signal"
DESCRIPTION:Abstract:  \nThe primordial density perturbations seen in the cosmic microwave background have collapsed under gravity to form the large-scale structure we see in the universe today. This evolution is non-linear\, and therefore introduces coupling between Fourier modes that would otherwise be independent. I will present two consequences of this non-linear coupling.\nHalo sample variance (arXiv:1406.3330):\nGaussian estimates for the errors in large-scale structure measurements exaggerate the scientific impact of these measurements. Non-linear evolution and finite volume effects are both significant sources of non-Gaussian covariance\, which reduce the ability of power spectrum measurements to constrain cosmological parameters. I will present a joint likelihood for cluster counts\, power spectrum and bispectrum\, including the non-Gaussian covariances\, and show that a joint analysis of these observables can reduce this “information loss”. In some cases\, the resulting improvement on cosmological parameters is equivalent to doubling the survey area.\nLyman-alpha – CMB lensing bispectrum (arXiv:1607.03625): \nThe Lyman-alpha forest seen in the spectra of quasars is a powerful tool for constraining warm dark matter models and the neutrino masses\, as well as properties of the intergalactic medium. Its use as a cosmological probe relies on modeling the connection between neutral gas and dark matter. I will present the first detection of the correlation between the Lyman-alpha forest and the cosmic microwave background\, using data from BOSS and Planck. This signal quantifies the non-linear response of the neutral hydrogen to a large-scale overdensity\, and thus tests our understanding of the connection between neutral gas and the dark matter.
URL:https://rpm.physics.lbl.gov/event/reserved-14/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20161117T160000
DTEND;TZID=America/Los_Angeles:20161117T170000
DTSTAMP:20260423T185325
CREATED:20161007T084842Z
LAST-MODIFIED:20161007T084842Z
UID:367-1479398400-1479402000@rpm.physics.lbl.gov
SUMMARY:Robert Kirshner (Moore Foundation) "Doing WFIRST Science Now:  Supernovae in the Infrared"
DESCRIPTION:Abstract.- An infrared-capable 2.4m telescope is presently in orbit:  the Hubble Space Telescope.  This makes it possible to do rest-frame infrared observations of Type Ia supernovae.  In the infrared\, SN Ia are more nearly standard candles and there is less obscuration by dust.  I will give a status report on RAISIN2\, an HST program that tiptoes into the realm of WFIRST science today.
URL:https://rpm.physics.lbl.gov/event/robert-kirshner-gordon-and-betty-moore-foundation-tba/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20161122T160000
DTEND;TZID=America/Los_Angeles:20161122T170000
DTSTAMP:20260423T185325
CREATED:20160919T153207Z
LAST-MODIFIED:20160919T153207Z
UID:305-1479830400-1479834000@rpm.physics.lbl.gov
SUMMARY:John Bradmiller-Feld (UCSB) "An Inclusive and Generic Search for Supersymmetry in the Multijet + Missing Momentum Final State Performed on pp Collision Data Collected with the CMS Detector"
DESCRIPTION:ABSTRACT\nFor the past two years\, the LHC has collided protons at a record-high center-of-mass energy of 13 TeV. This time has provided an opportunity to search for beyond standard model particles at the TeV scale\, including those predicted by supersymmetry\, with unprecedented sensitivity.  I will present an overview of a generic search for strongly-produced supersymmetric particles in pp collisions in the multijet + missing transverse momentum final state. The data sample corresponds to 12.9 fb-1 recorded by the CMS experiment in 2016. I will review the theoretical and experimental motivation for this search\, then describe the central challenges of the analysis\, namely the data-driven measurements of the standard model backgrounds. Finally\, I will summarize the results of the analysis\, and look ahead to possible directions for this and similar searches in the coming years.
URL:https://rpm.physics.lbl.gov/event/reserved-16/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20161129T160000
DTEND;TZID=America/Los_Angeles:20161129T170000
DTSTAMP:20260423T185325
CREATED:20160919T153236Z
LAST-MODIFIED:20160919T153236Z
UID:307-1480435200-1480438800@rpm.physics.lbl.gov
SUMMARY:Scott Kravitz (Stanford) "Identification of Single Barium Atoms for the nEXO Neutrinoless Double Beta Decay Experiment"
DESCRIPTION:Abstract:\nnEXO is a next-generation experiment designed to search for neutrinoless double beta decay of xenon-136 in a liquid xenon time projection chamber. Positive observation of this decay would determine the neutrino to be a Majorana particle\, as well as measure the absolute neutrino mass scale. In order to greatly reduce background contributions to this search\, the collaboration is developing several “barium tagging” techniques to recover and identify the decay daughter\, barium-136. Barium tagging may be available for a second phase of nEXO operation\, allowing for neutrino mass sensitivity beyond the inverted mass hierarchy. Tagging methods for this phase include barium-ion capture on a probe with identification by resonance ionization laser spectroscopy (RIS). An apparatus has been built to deposit barium atoms onto a surface and recover them using infrared laser desorption followed by RIS\, with the resulting ions passing through a time-of-flight mass spectrometer for further identification. Recent results from this system will be presented\, including those from incorporating an argon ion gun which allows for improved cleaning and preparation of the barium deposition substrate.
URL:https://rpm.physics.lbl.gov/event/reserved-17/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20161130T120000
DTEND;TZID=America/Los_Angeles:20161130T130000
DTSTAMP:20260423T185325
CREATED:20161123T094013Z
LAST-MODIFIED:20161123T094013Z
UID:398-1480507200-1480510800@rpm.physics.lbl.gov
SUMMARY:SPECIAL SEMINAR: Wai Ling Kimmy Wu (Stanford) "Constraining Inflation with BICEP/Keck and SPT"
DESCRIPTION:Abstract: \n\nInflation generically predicts a background of stochastic gravitational waves. In the standard cosmological model LCDM\, these primordial gravitational waves (PGW) are the only source to the odd-parity (curl) B-mode polarization on the Cosmic Microwave Background (CMB) at the epoch of recombination. Therefore\, we can learn much about inflation by constraining or potentially detecting primordial gravitational waves. In this talk\, I will present two frontiers that advance the search for primordial gravitational waves: instrumentation of BICEP3 and delensing with SPTpol. I will conclude with the future outlook of such search with CMB-S4.\n\nIn the first part of the talk\, I will discuss the design and performance of BICEP3 — the path-finder of BICEP/Keck program’s Stage-3 effort. The BICEP/Keck telescopes are small aperture (~0.5m) cryogenic refractors that focus on measuring the degree-angular scale feature of the PGW-generated B modes. BICEP3 has ~10x optical throughput compared to BICEP2 due to a larger field-of-view and aperture size. As a result\, we adopt new designs in BICEP3 for thermal filtering\, optical elements selection\, and detector modules packing. We deployed BICEP3 in the Austral summer of 2014-2015 and upgraded the instrument after the first season of testing and observations. I will present the improvements of the noise levels due to this upgrade.\n\nThe second part of my talk will focus on delensing SPTpol data. Gravitational lensing of primordial (curl-free) E modes generates B modes. These lensing B modes are a source of foreground contamination to detecting the PGW-generated B modes. We can characterize and reduce the lensing B-mode contribution through a technique called “delensing.” I will present results of a first demonstration of delensing on polarization data. In this work\, we delens B-mode maps from multi-frequency SPTpol observations of a 100 deg^2 patch of sky by subtracting a lensing B template constructed from two components: SPTpol E-mode maps and a lensing potential map formed from a Herschel 500 μm map of the CIB. In addition\, we build and use a suite of realistic simulations to study the current limitations and expected future improvements in delensing with implications for future experiments.
URL:https://rpm.physics.lbl.gov/event/special-seminar-wai-ling-kimmy-wu-stanford-constraining-inflation-with-bicepkeck-and-spt/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
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